Scraping-machine



O. DORTHEN.

SCBAPING MACHINE. APPLICATION FILED SEPT. 13, [919. 1,337,890, Patented Apr. 20, 1920'.

2 SHEETS-SHEET l.

A TTORNE Y.

0. DORTHEN.

SCRAPING MACHINE. APPLICATION FILED SEPT. 13, 1919.

Patented Apr. 20, 1920.

2 SHEETS-SHEET 2.

H... If... EEE======QM I l/2gp? I v I 1 w WE!i-EEMEEEEM? ii/514717! a IN VENTOR. BY v 0170 flofikera A TTORN E Y.

unrrnn STATES PATENT ormon.

OTTO DORTI-IEN, OF STILLWATER, MINNESOTA.

SCRAPING-MACHINE.

Application filed September 13, 1919.

To all whom it may concern.-

Be it known that I, OTTO DORTHEN, a citizen of the United States, residing at Stillwater, in the county of lVashington and State of Minnesota, have invented new and useful Improvements in Scraping-Machines, of which the following is a specification.

This invention comprehends the provision of a portable machine, prin'iarily de signed for use as a scraper for removing paints, rust or the like, although it is susceptible for other uses where a reciprocating motion is required.

To this end, the invention embodies among other features, a casing in which a crank shaftis journaled, fluid actuated rotors being fixed upon the shaft for rotating the latter, when air or other fluid is introduced from one end of the casing and directed into the buckets of the rotors.

The nature and advantages of the invention will be better understood when the following detail description is taken in connection with the accompanying drawing, the invention residing in the construction, combination and arrangement of parts as claimed.

In the drawings forming part of the specification like numerals of reference indicate similar parts in the several views and wherein Figure 1 is an elevation of the machine constructed in accordance with the preferred embodiment of the invention.

Fig. 2 is an elevation of one section of the casing.

Fig. 3 is a vertical sectional view taken through Fig. 1.

Fig. i is a transverse sectional view taken through the machine.

Fig. 5 is a similar view taken on the line 55 of Fig. 1.

Fig. 6 is a side elevation partly in section.

The machine forming the subject matter of my invention embodies a casing prefen ably made up of two identically constructed sections 10, such as indicated in Fig. 2. Each section is reduced at its opposite ends so that when the sections are secured together the reduced portions 11 define a nozzle 12, which is provided with an exteriorly threaded portion 13 for association with the hose let leading from a source of compressed air or other fluids. The reduced portion 15 at the opposite ends of the section define a guide through which the tool holder recip- Specification of Letters Patent.

Patented Apr. 20, 1920.

Serial No. 323,550.

rocates as will be hereinafter described. The guide however is preferably of angular formation in cross section, corresponding to the similar configuration of the tool holder to which it is adapted to accommodate. A crank shaft is arranged within the casing transversely thereof, and journaled for rotation as at 17. The crank shaft passes through a central compartment 19 constituting a crank case for the crank portion of the shaft, and compartment 20 arranged at opposite sides of the compartment 19, the compartment 20 being adapted to accommodate and receive the rotors 21 fixed upon the shaft 18. The crank case or compartment 19 is formed to provide a lubricant reservoir Each section is also provided with divergently disposed grooves 23 which meet at a point centrally of the casing immediately above the air intake nozzle 12, the grooves when the sections are associated defining passages for directing the air or other fluid to the compartments 20. The rotors 21 are provided with buckets 2d which may be of any suitable construction, and when the fluid is introduced into the bucket 2d, the rotors operate the shaft 18. A pitman 25 is connected with the crank portion of the shaft for reciprocatory movement, the pitman being connected with the adjacent end of a tool holder 26. The tool holder 26 is of angular formation in cross section, and is arranged to reciprocate in the guide 15. As shown in this specific instance, a scraper blade 27 is removably associated with the holder 26 adapting the machine for use in the capacity of a scraper for removing paint, rust or the like. It might here be stated, however that the machine may be used in other capacities with different type tools, such as for drilling, reaming, grinding, or polishing. The terminals of the shaft 18 project beyond the opposite sides of the casing, and have fixed thereto buffer or emery wheels 28.

The machine in its entirety, is of a size to be conveniently handled for the purpose intended, and in practice, air or other fluid is introduced into the casing from the hose 14 through the nozzle 12. The fluid immediately enters the grooves or passages 23 which connnunicate with the compartments 20, thus conveying the fluid into the buckets 24 of the rotor 21. The compartments 20 are provided with exhaust openings 29 which are controlled by suitable valves 30,

and in this manner the speed of the exhaust can be easily regulated. As the rotors are rotated, together with the shaft, 18, a reciprocatory motion is imparted to the pitman 25 and the tool holder 26. The respective sections of the casing may be secured together in any suitable manner, to permit of a quick association of parts or a disassemblage thereof as the occasion may require.

As shown in Fig. 6, the rotor indicated at 30 is rotated by the fluid acting against the rotor at appropriate points at the oppo site sides of the latter, or at diametrically opposite points. The air inlet 31 is provided with the branches 32 and 33 respectively, the former being relatively short, While the latter is comparatively long and shaped to conform to the configuration of the rotor, terminating in the direction to introduce the fluid against the rotor in the 7 direction of rotation of the latter. Mani festly this construction increases the power of the machine and properly equalizes or balances the rotors.

While I have shown and described what I consider the preferred embodiment of the invention I desire to have it understood that I do not limit myself in this connection and that such changes may be resorted. to when desired as fall within the scope of what is claimed. 7

What I claim is 1. In a machine of the class described, av casing, a crank shaft journaled therein, ro-

tors fixed upon the shaft and including fluid receiving buckets, said casing having a fluid inlet, means for directing the fluid to the bucket, a pitman connected with said shaft, and a tool holder detachably associated with said pitman and arranged for reciprocatory motion within the casing.

2. In a machine of the class described, a casing, a crank shaft journaled therein, said casing being formed to provide a plurality of spaced compartments, one of said compartments defining a crank case for the crank portion of the shaft, rotors fixed upon said shaft and operable in the other of said compartments, said rotors including fluid receiving buckets, said casing having a fluid inlet, means for directing the fluid from said inlet to the rotor receiving compartments, said compartments having exhaust openings and means for controlling said openings to regulate the speed of said rotors, and a pitman associated with said shaft.

3. In a machine of the class described, a casing, a crank shaft journaled therein, spaced compartments formed in said casing,

.rotors fixed upon said shaft and operable in said compartments, said casing having a fluid inlet opening and divergently disposed passages for directing the fluid to said compartments, a pitman connected with said shaft, a tool holder associated with said pitman and arranged to reciprocate through one end of the casing, and means for guiding the said holder.

4. A machine of the class described com- 7 prising a casing, spaced compartments arranged in said casing, a crank shaft journaled in said casing, rotors fixed upon said shaft and operating in said compartments,

v said casing having a fluid inlet opening and divergently disposed passages for directing the fluid to said compartments, a pitman connected with said shaft, a tool holder associated with said pitman and arranged to reciprocate within the casing, said compartments having exhaust openings, valves controlling said opening, and said shaft projecting beyond the sides of the casing.

5. In a machine of the class described, a casing having reduced end portions, one of said portions constituting an air inlet, a tool holder, the other of saidend portions constituting a guide for said holder, a crank shaft journaled in said casing, spaced compartments formed in the casing, rotors fixed upon said shaft and operable in said compartments, said casing having divergently disposed passages for directing the fluid from said inlet opening to said compartments, and a pitman connected with said shaft and detachably associated with the adjacent end of said tool holder. 7

In testimony whereof I affiX my signature.

OTTO DORTHEN. 

